Network-1 Technologies, Inc. v. Google, L.L.C.

Background

Network-1 Technologies, Inc. alleged that Google LLC and YouTube LLC infringed three patents through YouTube’s Content ID system, which compares uploaded audio and video with reference works and may take an action based on a match. The patents were the ’988 Patent, the ’237 Patent, and the ’464 Patent. The parties disputed claim terms concerning searches and the extraction of features from media works.

The court considered the parties’ proposed claim constructions, the defendants’ motion for summary judgment on non-infringement, Network-1’s cross-motion for summary judgment concerning certain affirmative defenses, and Network-1’s appeal from a discovery order issued by Magistrate Judge Sarah Netburn.

Claim Construction and Indefiniteness

The court adopted agreed constructions for several terms, including “sublinear,” “neighbor,” “near neighbor search,” “approximate nearest neighbor search,” and “machine-readable instructions.” It also addressed four disputed terms: “non-exhaustive search,” “correlation information,” “extracted features,” and “extracting features.”

The court held that “non-exhaustive search” was indefinite. Under the governing standard, a patent claim is indefinite when it fails to inform skilled readers, with reasonable certainty, about the scope of the invention. The court found that the patents’ intrinsic evidence did not define the term and that the extrinsic evidence supported multiple reasonable meanings. Because different search methods could be classified differently depending on which meaning applied, a person seeking to avoid infringement could not determine with reasonable certainty whether a particular search was covered.

The court also held that adding the “sublinear” limitation in claim 17 of the ’988 Patent did not clarify “non-exhaustive search.” As a result, the asserted claims of the ’988 and ’464 Patents were invalid as indefinite.

The court rejected the defendants’ argument that “correlation information” was indefinite and adopted Network-1’s proposed construction: information associating the first electronic media work with an electronic media work identifier. The court also adopted Network-1’s proposed constructions of “extracted features” and “extracting features,” which included electronic data sampled, calculated, or otherwise derived from the work itself, rather than from information added or appended to it.

Summary Judgment on the ’237 Patent

Claim 33 of the ’237 Patent required a computer system to identify a media work by performing a sublinear approximate nearest-neighbor search of reference extracted features. The parties agreed that a sublinear search is one whose execution time grows less than proportionally to the size of the data set, assuming computing power remains constant.

The court granted the defendants’ motion for summary judgment on Network-1’s infringement claim based on the ’237 Patent. Regarding the older LSH version of Content ID, the court found that Network-1’s expert materials did not provide sufficient factual support for a finding that the complete, two-stage search was sublinear. Evidence about the system’s first stage did not establish that the entire search, including the second stage, met the limitation.

Regarding the newer Siberia version, the court found that the evidence showed search algorithms that scaled linearly as the database grew. Adjusting the number of shards, partitions, or other parameters could reduce resource costs, but did not transform a linear search into a sublinear one under the agreed definition. The court also found that Network-1 had not supplied adequate evidence that the Siberia system performed the required approximate nearest-neighbor search as part of a qualifying sublinear search.

Other Dispositions

The court denied Network-1’s cross-motion for summary judgment. Because the court’s indefiniteness rulings and summary-judgment ruling disposed of all asserted claims, it denied Network-1’s appeal from Magistrate Judge Netburn’s discovery order as moot.

In its conclusion, the court stated that the asserted claims of the ’988 and ’464 Patents were invalid as indefinite, that the defendants’ motion for summary judgment on the ’237 Patent infringement claim was granted, and that Network-1’s cross-motion for summary judgment was denied. Judge Paul G. Gardephe directed the clerk to enter judgment for the defendants, terminate the relevant motions, and close the case.